Edge Detection
Trace the outlines in any photo — a Laplacian filter lights up boundaries and drops flat areas to black. Free, private, and instant — processed in your browser, never uploaded.
Upload an image
Drop image here
or click to browse
Options
One-click outlines
Upload an image and the edges are traced instantly — boundaries light up and flat areas fall to black.
100% private
Your image is processed entirely in your browser using the Canvas API — nothing is ever uploaded to a server.
Free and unlimited
No signup, no watermark, no daily limit. Process as many images as you like.
How to detect edges in an image
Upload your image
Drag and drop or click to select a JPG, PNG, or WebP image.
See the outlines
The edge-detection filter is applied automatically and shown in the live preview.
Pick a format
Choose PNG to keep transparency or JPG for the smallest file size.
Download
Click download to save the outlined image to your device.
Frequently asked questions
How do I find the edges in an image?
Upload your image above and the edge-detection filter traces its outlines instantly in the live preview. Then click download to save it. Everything runs in your browser.
Is the edge detection tool free?
Yes — completely free and unlimited. No signup, no account, no watermark, no daily limit.
Are my files uploaded to a server?
No. The edge detection happens entirely in your browser on your device. Your image never leaves your computer, so it stays fully private.
What does edge detection do?
It applies a Laplacian convolution kernel that responds to sharp changes in brightness, so the boundaries between shapes light up as bright outlines while smooth, flat regions turn black.
Outline another image
Drop in a new photo to trace its edges — free and unlimited, no signup required.
Choose The Right Tool
Why this page exists
Use edge detection to trace the outlines in a photo — a Laplacian kernel lights up boundaries and drops flat areas to black — entirely in your browser.
Best for
- Line-art and sketch-style conversions
- Highlighting shapes, contours, and structure
- Technical, blueprint, and stylized outline graphics